How did beyond Museum find the unexposed lens of the 9 1 Life Contact Concert?

Playstation editors get valuable pictures through search, and the sources are often the following aspects:

1. The backstage staff of the concert or the members of the band personally took photos.

2. Photographed and edited by an official photographer, but edited before the final version was released.

3. It was taken by fans at that time

These materials can generally be found in closed forums and personal QQ groups in Hong Kong, but the probability is very small; It can also be obtained by directly visiting the parties in the above situation. No face, you can only buy it with money.